I don't really think TC blipping on at the moment you touch the throttle is an issue. Yes its not realistic, but in reality it doesn't effect your driving what so ever. The game will also not recreate the cars real-life TC system at all, which is why I just turn it off straight away. It's a game aid, not a true to life replicated driving feature.
It doesn't just start the moment you touch the throttle, it occurs on a number of occasions it shouldn't.
Is it in itself a problem? Well not really, but it does indicate that an underlying issue exists with some part of the physics engine, and it something being labeled as a sim that's worth discussing.
As for not recreating real world TC systems, why not? Other sims on the market do, so why not GTS?
Also, (tyre issues), RWD cars will also only turn on-launch if the grip is different on the rear tyres or the diff is giving 1 wheel more power for whatever reason. The game is very digital. The tarmac will have perfectly even grip on both tyres and the diff / etc will be perfect. This "exact" digital environment is always going to hide real-life nuances imo. FF torque steer for example, what do you do for pad users? Introduce steering they have to correct? I can understand leaving that out. Also in the vid at the end, the spinning did start (albeit subtly) straight away.
No car, and I mean no car, has identical levels of grip on each tyre. The reasons quite simple, with driver and fluids not car is perfectly symmetrical in terms of load distribution, so no two tyres have the exact level of grip and no two wheels will have the exact same amount of power delivered to them.
Also the spinning didn't start straight away, I know, I was the one driving.
Have you tried starting at Brands? There we have a distinct angle on the track, giving the game enough difference to do this rear-wheel-drive spin you want. It's there.
It should do it on a perfectly flat and level surface, it doesn't, which indicates an issue with the tyre model.
Launches not biting.... If you're using grippy tyres and are gentle with the throttle it definitely bites. I've had plenty of starts bog down due to being too-careful and had to ride the torque until the power comes in.
You may need to rewatch, I said they don't bite realistically. Of course they bite, the car would never move if they didn't, but they don't do it how they should.
Also, the brakes, they're fine imo, but I game on a pad, and coming from a track-motorcycle background using my hands for braking is natural for me. Trail braking, it digging in then braking too hard and under steering, it all seems pretty nice to me.
I run a set of T3PA Pro pedals and the braking isn't realistic at all with them, the progression is linear, which it shouldn't be - it should build more as you apply more force. Now that works well with a pad, but feels very unnatural with pedals, the braking also gives almost no feedback via a wheel as well.
I feel people are a tad too picky
Why shouldn't we be?
GT often gets touted as a sim, I've had more than enough claim that its the best sim around, the strap-line for it calls it the 'real driving simulator'.
Given that its perfectly fair to examine that, particularly when plenty of sims do simulate these areas far better. Even more infuriatingly PD have done this better, as none of these issues were present in the Copper Box build I drove over a year ago.